Thread-guide-operating device for straight-bar knitting machines



May 28, 1929. P. LIEBERKNECHT THREAD GUIDE OPERATING DEVICE FOR STRAIGHT BAR KNITTING MACHINES Filed Feb. 15, 1928 ezwen 02: v

'l atented May 2, 129.

PAUL LIEBEBKNECHT, OF GHEMNITZ, GERMANY, ASSIGNOR TO MA SCI-IINENFABRIK EINSIEDEL GESELLSGHAFT M. B. 5., OF EINSIED'EL, NEAR CHEMNITZ, GERMANY.

THREAD-GUIDE-OPERZLTING DEVICE FOR STRAIGHT BAR KNITTING MACHINES.

Application filed February 15, 1928, Serial No. 254,526,,21116. in Germany May 2, 1927.

The thread-guides of straight-bar knitting machines are usually operated by means of a driving pin connected to a frame which is threaded on an operating rod and en gaged frictionally with the latter. The friction is obtained by means of plates which bear against the rod by leather or like linings and which are clamped to the same by means of leaf springs and a clamping shackle fitted with. a screw which bears against the arched back of one of the springs. The shackle is guided in the frame at right angles to the rod,-and the friction elements must, owing to constructional reasons, have a certain amount of free play within the frame. When the rod is actuated, its movement is transmitted through the friction. plates and through the shackle to the frame and to the driving pin. On the arrival of the threadguide at the. end of the travel, a shock is produced which reacts on the frame and which, if the frictional elements have not, by a displacement relative to the clamp, been brought into contact with the frame, is liable to cause a recoil of the thread-guides and a detrin'iental displacement of the same relative to the needles.

The object of the present invention is to eliminate this defect, and the invention consists in arranging the clamp loosely within the frame so that it can move independently of the latter. Thus the movement will be transmitted direct bythe friction elements The thread-guide of a knitting machine is operated by means of driving pin (Z (Fi g. 3) which is carried by the head a of a frame which is loosely threaded by means of 1ts end members a anda on the longitudinally movable operating rod n. Between the side mem bers h of the frame two sets of friction elements are arranged which bear against the rod 12. from opposite sides. Each set is composed of a plate iii which bears against the rod 02. by means of a leather or like lining 9 and which is held against the rod n by arched leaf springs f. A U-shaped shackle c, which is loosely guided between the frame members 7), embraces the springs and the plates and engages in, notches made in the edges of thesame so as to hold them in position. A block 2', which is pivotally held between the shackle members, carries an adjusting screw 70 which bears at m against the pointed back of the adjacent spring'j' and clamps the friction elements to the rod a with a pressure which can be regulated ac cording to requirements.

If the rod-n moves, say in the direction C,

This engagement of the plates with guide from recoiling at the end of the travel.

I claim: a

A thread guide operating device for straight-bar knitting machines,- com nising a longitudinally movable operating rod, a pair of plates hearing by means of friction elements against said rod, leaf springsfbearing against said plates, a shackle embracingsaid plates and springs and controlling their relative positions by engagement with notches in the edges thereof, an adjusting screw fitted. in the shackle andadapted to cooperate therewith for clamping the plates to. the rod through the medium of the springs, and a frame provided with a driving pin threaded loosely on the rod and adapted to be engaged by and receive motion from said plates.

* PAUL LIEBERKNEOHT. 

